单项选择题

According to the author, a key factor in the ability to reason is ______.

A．the subject's knowledge of grammar
B．the amount of sleep the subject has had
C．the level of arousal of the subject
D．the extent to which the subject has been taught to mason

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单项选择题

The author's knowledge of Tibet is probably ______.

A．based on firsthand experience
B．the result of lifelong studies
C．derived from books only
D．limited to geological history

单项选择题

What the critics said in the first paragraph amounts to the idea that ______.

A．no admission policies based on race should be implemented.
B．minority applicants should be given favorable considerations.
C．different standards for admitting minority students should be set up.
D．selective colleges and universities should be punished for their discriminatory policies.